Готові списки джерел за темами / Melt transfer

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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Melt transfer"

1

RATTEE, I. D. "Melt-transfer and Film-release Systems of Transfer Printing." Journal of the Society of Dyers and Colourists 93, no. 5 (October 22, 2008): 190–94. http://dx.doi.org/10.1111/j.1478-4408.1977.tb03342.x.

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2

Kisters, A. F. M., R. A. Ward, C. J. Anthonissen, and M. E. Vietze. "Melt segregation and far-field melt transfer in the mid-crust." Journal of the Geological Society 166, no. 5 (September 2009): 905–18. http://dx.doi.org/10.1144/0016-76492009-012.

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3

Taylor, John A., M. Prakash, G. G. Pereira, P. Rohan, Michael Lee, and Barbara Rinderer. "Predicting Dross Formation in Aluminium Melt Transfer Operations." Materials Science Forum 630 (October 2009): 37–44. http://dx.doi.org/10.4028/www.scientific.net/msf.630.37.

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Aluminium melt transfer operations can lead to significant amounts of dross formation as a result of chemical oxidation and physical entrapment processes. It has been suggested that these activities may contribute up to 50% of the total metal loss of ~1% in a typical primary aluminium smelter (i.e. 2,500 tonne/annum (tpa) in a smelter of 500,000tpa output). This is a large financial loss to any company, and also, in the new CO2-conscious era, it also represents a significant carbon footprint to ameliorate. A significant proportion of this metal loss may be prevented by adopting more efficient melt transfer strategies that reduce splashing and turbulence thereby resulting in reduced oxide and therefore dross formation. Optimisation of such systems is normally achieved by trial-and-error approaches, however a clear opportunity exists for rapid optimisation by employing computational modelling to explore the effects of changed equipment design and process conditions, such as tilt speed, spout height, spout geometry, etc. In the present paper, the Smoothed Particle Hydrodynamics (SPH) modeling method is used to predict the amount of oxide generated during molten metal transfers from a 500kg capacity tilting crucible furnace into a heated sow mould. Various conditions were tested. An oxidation model based on skimming trials performed in a laboratory-scale (8kg) oxidation rig is employed in the simulation. The predicted oxide from the simulations is compared against those of the experimental pours. It is anticipated that the validated model will be used for modifying the design and optimizing the operation of various melt transfer operations occurring in the aluminium industry.
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4

Kim, Kwang-Joo, and Alfons Mersmann. "Direct Contact Heat Transfer in Melt Crystallization." JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 31, no. 4 (1998): 527–35. http://dx.doi.org/10.1252/jcej.31.527.

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5

Baram, J. "Heat transfer characteristics in centrifuge melt-spinning." Journal of Materials Science 23, no. 10 (October 1988): 3656–59. http://dx.doi.org/10.1007/bf00540509.

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6

Kuhn, M. "Micro-Meteorological Conditions for Snow Melt." Journal of Glaciology 33, no. 113 (1987): 24–26. http://dx.doi.org/10.1017/s002214300000530x.

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AbstractThe energy budget of a snow or ice surface is determined by atmospheric variables like solar and atmospheric long-wave radiation, air temperature, and humidity; the transfer of energy from the free atmosphere to the surface depends on the stability of the atmospheric boundary layer, where vertical profiles of wind speed and temperature determine stability, and on surface conditions like surface temperature (and thus surface humidity), roughness, and albedo.This paper investigates the conditions exactly at the onset or the end of melting using air temperature, humidity, and as the radiation term the sum of global and reflected short-wave plus downward long-wave radiation. For the turbulent exchange in the boundary layer, examples are computed with a transfer coefficient of 18.5 W m−2K−1which corresponds to the average over the ablation period on an Alpine glacier. Ways to estimate the transfer coefficient for various degrees of stability are indicated in the Appendix.It appears from such calculations that snow may melt at air temperatures as low as –10°C and may stay frozen at +10°C.
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7

Kuhn, M. "Micro-Meteorological Conditions for Snow Melt." Journal of Glaciology 33, no. 113 (1987): 24–26. http://dx.doi.org/10.3189/s002214300000530x.

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AbstractThe energy budget of a snow or ice surface is determined by atmospheric variables like solar and atmospheric long-wave radiation, air temperature, and humidity; the transfer of energy from the free atmosphere to the surface depends on the stability of the atmospheric boundary layer, where vertical profiles of wind speed and temperature determine stability, and on surface conditions like surface temperature (and thus surface humidity), roughness, and albedo.This paper investigates the conditions exactly at the onset or the end of melting using air temperature, humidity, and as the radiation term the sum of global and reflected short-wave plus downward long-wave radiation. For the turbulent exchange in the boundary layer, examples are computed with a transfer coefficient of 18.5 W m−2 K−1 which corresponds to the average over the ablation period on an Alpine glacier. Ways to estimate the transfer coefficient for various degrees of stability are indicated in the Appendix.It appears from such calculations that snow may melt at air temperatures as low as –10°C and may stay frozen at +10°C.
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8

Westerberg, K. W., and B. A. Finlayson. "HEAT TRANSFER TO SPHERES FROM A POLYMER MELT." Numerical Heat Transfer, Part A: Applications 17, no. 3 (April 1990): 329–48. http://dx.doi.org/10.1080/10407789008944746.

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9

Yang, Youqing, Zhen Chen, and Yuwen Zhang. "Melt flow and heat transfer in laser drilling." International Journal of Thermal Sciences 107 (September 2016): 141–52. http://dx.doi.org/10.1016/j.ijthermalsci.2016.04.006.

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10

McFadden, R. R., C. Teyssier, C. S. Siddoway, D. L. Whitney, and C. M. Fanning. "Oblique dilation, melt transfer, and gneiss dome emplacement." Geology 38, no. 4 (April 2010): 375–78. http://dx.doi.org/10.1130/g30493.1.

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Дисертації з теми "Melt transfer"

1

Chakraborty, Sanjib. "Melt flow and heat transfer in continuous casting ladles and tundishes /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487694389392267.

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2

Dyck, Brendan. "Textural and petrological studies of anatexis and melt transfer in the Himalayan Orogen." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:98cc1d84-d552-447d-a54a-0f028eecf0f7.

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Mineral textures, preserved in the metamorphosed sedimentary sequences that are exposed in orogenic hinterlands, are crucial to understanding the architecture and evolution of collisional mountain belts. In this thesis the textural record of anatexis and melt transfer in the Himalayan metamorphic core is decoded and the controls that these processes exert on the tectonic evolution of the Himalaya are explored. The problem is divided into two parts, corresponding to variations in protolith lithostratigraphy: melt source - the pelitic region where melt was first generated, and melt sink - the psammitic region where melt accumulated and crystallised. Dehydration melting of muscovite has long been recognized as a critical reaction for the generation of anatectic melt in the Himalaya, but a textural understanding of how this reaction progresses is limited by the inherent difficulties in identifying specific reaction products. Using samples collected from the Langtang area in central Nepal, a mechanistic model for muscovite dehydration melting was constructed, and a set of textural criteria were developed, which were used to distinguish peritectic K-feldspar from K-feldspar grains formed during melt crystallisation. Melt is transferred from the source to the sink in two stages: firstly along a pervasive network of mineral grain boundaries, and secondly via a channelised network of sills and dykes in the melt sink where it solidified as leucogranite. Variation in the primary mineral assemblage and appearance of leucogranite bodies reflect the degree of interaction that occurred between the melt and metasedimentary country rock, rather than a change in primary melt composition. The modal proportion of K-feldspar in the melt source requires vapour-absent conditions during muscovite dehydration melting and leucogranite formation, indicating that the generation of large volumes of granitic melts in orogenic belts is not necessarily contingent on an external source of fluids. The crystallisation of hydrous minerals in leucogranite consumes <15.5 % of water released by the breakdown of muscovite. These results indicate that anatexis efficiently dehydrates the middle crust and suggests that the continents have limited potential to store water over geological time.
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3

Hsiao, Hsien-Fu. "Mechanical behavior and heat transfer in polymer fiber melt-spinning and drawing processes." Connect to resource, 1997. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osuosu1243349868.

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4

Zhao, Yuer. "A Numerical Study of Melt Pool Heat Transfer in the IVR of a PWR." Thesis, KTH, Fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297867.

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This thesis aims to provide the thermal condition of melt pool convection by CFD simulation, which is important to the assessment of the invessel melt retention (IVR) strategy widely adopted in Generation III pressurized water reactors (PWRs). As a severe accident mitigation measure, the IVR strategy is realized through external cooling of the lower head of a reactor pressure vessel (RPV). To achieve the coolability and retention of the corium pool in the RPV lower head, the heat flux at the outer surface of the vessel should be less than the critical heat flux (CHF) of boiling around the lower head. Under such condition, the integrity of the RPV is guaranteed by the adequate thickness of the unmelted vessel wall. The thesis work starts from the selection and validation of a turbulence model in the CFD computational tool chosen (Fluent). Afterwards a numerical model is set up for estimation of melt pool heat transfer of a reference PWR with the power capacity of 1000 MWe, including a mesh sensitivity study. Based on the numerical model of a twolayer melt pool, four tasks are carried out to investigate the effects of Zr oxidation ratio, Fe content, and radiation emissivity on heat flux profiles, as well as the focus effect under extreme conditions. Selection and validation of the turbulence model are conducted by comparing the simulation results of different turbulence models with the DNS data on the convection of volumetrically heated fluid layer bounded by rigid isothermal horizontal walls at equal temperature. The internal Rayleigh numbers of the flow reach up to 10e6. The comparison shows a good agreement of the SST k-ω turbulence model results with the DNS data. The simulations with the Zr oxidation ratio of 0, 0.2 and 0.5, correspondingly, the oxide layer of 1.389m, 1.467m and 1.580m, and the metal layer of 0.705m, 0.646m and 0.561m in height, show that, the temperature of the oxide layer will increase with Zr oxidation ratio, while the temperature of the metal layer will decrease resulting in more heat transfer through the oxide layer sidewall and less top radiation. Nevertheless, the effect of the Zr oxidation ratio is not pronounced in the range of 00.5. The simulations with the Fe mass of 22t, 33t and 45t, and respective height of the metal layer of 0.462m, 0.568m and 0.646m, show that, the inner metal layer will significantly increase the temperatures of both the metal layer and the oxide layer. The percentage of heat transfer at the oxide layer sidewall will increase to supplement the reduction of that at the metal layer. The simulations with the radiation emissivity of 0.2, 0.35, 0.45 and 0.7 show that, the emissivity below 0.45 has an impact on heat transfer, and the temperatures and sidewall heat flux of both the oxide layer and the metal layer will increase with decreasing emissivity. The impact is negligible when the emissivity is above 0.45. The simulations under the hypothetically extreme conditions with either an adiabatic top boundary or a very thin metal layer show the focusing effect may occur, i.e., the heat flux through the metal sidewall is larger than that in the oxide layer. But the local high heat flux is flattened by the vessel wall with good heat conductivity. In summary, the simulations demonstrate that, except for the cases under extreme conditions, the heat fluxes of the melt pools in all other cases are significantly lower than the CHF of external cooling of the lower head. Therefore, the safety margin of the IVR strategy of the PWR chosen is seems sufficient. However, due to some limitations (e.g., simplification and assumptions) in the simulation cases and coupling of different influential factors, as indicated by the present study, the precise predictions of heat flux under all scenarios are still difficult. Therefore, the conclusions could not be generalized to the other conditions or other configurations of the molten pools. By discussing the model and simplifications/assumptions adopted in this work, the improvement directions of the numerical model and other perspectives are proposed at the end of the thesis.
Denna avhandling syftar till att tillhandahålla det termiska tillståndet för smältbassängskonvektion genom CFD-simulering, vilket är viktigt för bedömningen av IVR-strategin som allmänt antagits i tryckvattenreaktorer (PWR) i Generation III. Som en åtgärd för att mildra allvarliga olyckor realiseras IVR-strategin genom extern kylning av det nedre huvudet av ett reaktortryckkärl (RPV). För att uppnå kylbarhet och kvarhållning av koriumbassängen i det nedre RPV-huvudet bör värmeflöde vid den yttre ytan av kärlet vara mindre än det kritiska värmeflödet (CHF) som kokar runt det nedre huvudet. Under sådant tillstånd garanteras RPV: s integritet av den osmälta kärlväggens tillräckliga tjocklek. Examensarbetet startar från valet och valideringen av en turbulensmodell i det valda CFD-beräkningsverktyget (Fluent). Därefter sätts en numerisk modell upp för uppskattning av smältbassängens värmeöverföring av en referens PWR med en effektkapacitet på 1000 MWe, inklusive en nätkänslighetsstudie. Baserat på den numeriska modellen för en tvålagers smältbassäng utförs fyra uppgifter för att undersöka effekterna av Zr-oxidationsförhållande, Fe-innehåll och strålningsemissivitet på värmeflödesprofiler, liksom fokuseffekten under extrema förhållanden. Val och validering av turbulensmodellen utförs genom att jämföra simuleringsresultaten för olika turbulensmodeller med DNS-data för konvektionen av volymetriskt uppvärmt fluidskikt avgränsat av styva isoterma horisontella väggar vid lika temperatur. De interna Rayleigh-siffrorna i flödet når upp till 10e6. Jämförelsen visar att SST k-ω turbulensmodellresultaten överensstämmer med DNS-data. Simuleringarna med Zr-oxidationsförhållandet 0, 0,2 och 0,5, motsvarande oxidskiktet på 1,389 m, 1,467 m och 1,580 m, och metallskiktet på 0,705 m, 0,664 m och 0,561 m i höjd, visar att temperaturen av oxidskiktet kommer att öka med Zr-oxidationsförhållandet, medan metallskiktets temperatur kommer att minska vilket resulterar i mer värmeöverföring genom oxidskiktets sidovägg och mindre toppstrålning. Ändå är effekten av Zr-oxidationsförhållandet inte uttalad i intervallet 00,5. Simuleringarna med Fe-massan på 22t, 33t och 45t och respektive höjd av metallskiktet på 0,462m, 0,568m och 0,664m visar att det inre metallskiktet avsevärt kommer att öka temperaturerna för både metallskiktet och oxiden lager. Andelen värmeöverföring vid oxidskiktets sidovägg ökar för att komplettera minskningen av den vid metallskiktet. Simuleringarna med strålningsemissiviteten 0,2, 0,35, 0,45 och 0,7 visar att emissiviteten under 0,45 påverkar värmeöverföringen, och temperaturerna och sidoväggens värmeflöde för både oxidskiktet och metallskiktet kommer att öka med minskande emissivitet. Effekten är försumbar när strålningen är över 0,45. Simuleringarna under de hypotetiskt extrema förhållandena med antingen en adiabatisk övre gräns eller ett mycket tunt metallskikt visar att fokuseringseffekten kan uppstå, dvs. värmeflödet genom metallsidan är större än det i oxidskiktet. Men det lokala höga värmeflödet plattas ut av kärlväggen med god värmeledningsförmåga. Sammanfattningsvis visar simuleringarna att, förutom fall under extrema förhållanden, är värmeflödet från smältpoolerna i alla andra fall betydligt lägre än CHF för extern kylning av nedre huvudet. Därför verkar säkerhetsmarginalen för IVR-strategin för den valda PWR tillräcklig. På grund av vissa begränsningar (t.ex. förenkling och antaganden) i simuleringsfall och koppling av olika inflytelserika faktorer, vilket indikeras av den aktuella studien, är de exakta förutsägelserna av värmeflöde under alla scenarier fortfarande svåra. Därför kunde slutsatserna inte generaliseras till de andra förhållandena eller andra konfigurationer av de smälta poolerna. Genom att diskutera modellen och förenklingar / antaganden som antagits i detta arbete föreslås förbättringsriktningarna för den numeriska modellen och andra perspektiv i slutet av avhandlingen.
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5

Konovalikhin, Maxim. "Investigations of Melt Spreading and Coolability in a LWR Severe accident." Doctoral thesis, KTH, Energy Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3244.

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6

Kotze, Tyrone. "The influence of heat transfer limitations on the properties of PET yarn produced by melt spinning." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5304.

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The production of synthetic yarns requires a cost efficient process whilst simultaneously incorporating process methods which ultimately lead to a high quality fibre. A critical part of the production process is the spinning of the molten polymer into individual filaments which are brought together to form the filament bundle. During this process a quench air stream is blown across the filament bundle to aid in cooling the molten polymer. Here, heat transfer limitations may cause inter-filament property variations, which will adversely affect the quality of the yarn. This thesis focuses on the development of a model which allows for an a priori prediction of the influence of major process variables on the degree of fibre property uniformity. Fibre quality is characterised by the high degree of uniformity in the properties which affect the structural features of the yarn. Yarn morphology is dictated by the degree of crystallinity and molecular alignment of the polymer macro-molecules parallel to the fibre axis. These properties are strongly influenced by online tensile stress and local temperature which are, in turn, affected by heat transfer effects between the quench air and filament surface. A model that predicts the influence of heat transfer limitations on the uniformity of the as-spun fibre is therefore needed. Previous research in this field is limited with most work focussed on single filament model development. In this investigation, a monofilament model developed by previous workers (Jarecki et al., 2000) is integrated into a multifilament framework. This model assumes Newtonian behaviour of the polymer with viscosity strongly dependent on local temperature and crystallinity. The development of the multifilament model involves dividing the spinning zone into a number of cells, in which the filament properties are modelled using the monofilament model. The change in quench air temperature is estimated by means of an energy balance incorporating air flow terms and heat transfer through forced convection from the filament surface. A novel iteration approach is proposed in which the temperature of the quench air exiting each cell is iterated for until convergence is met. In simplifying the model, it was found that uniform quench air flow profile could be assumed, since the quench flow channel length was found to fall far short of the length required for turbulent flow to develop. However, it is known that increased contact time for heat transfer would occur if air were dragged down with the filament. Although modelling this effect is beyond the scope of the project, the heat transfer gradients are worsened by air-dragging and hence the model presented in this thesis reveals whether polymer uniformity is possible even under the best possible flow patterns. A negative result therefore indicates that non-uniformity will definitely occur.
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7

Zajacz, Zoltán. "Mass transfer during volatile exsolution in magmatic systems : insights trough methodological developments in melt and fluid inclusion analysis /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17254.

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8

Di, Ciano Massimo. "Measurement of primary region heat transfer in horizontal direct chill continuous casting of aluminum alloy re-melt ingots." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/32372.

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Thermal-fluid modeling of the Horizontal Direct Chill (HDC) casting process has been used to aid in process optimization and development of HDC casting of aluminum foundry alloy re-melt ingots. Characterization of the heat transfer conditions present in the process is essential to accurate model development. In this study, the heat transfer conditions in the primary cooling region of an HDC casting machine were characterized using mould temperature measurements taken during plant trials. Steady state mould heat flux distributions were determined for various casting conditions through inverse heat conduction modeling. The calculated heat fluxes are of comparable magnitude to values reported in DC casting literature. Mould heat fluxes were affected by casting speed but relatively insensitive to casting temperature and mould water flow rates. To compliment the plant trial approach, an apparatus was built to replicate primary cooling region heat transfer phenomenon. Mould temperatures taken from the casting simulator were used to determine mould heat fluxes during lab tests. Comparing lab results and plant trial results confirm the applicability of the lab tests to in-plant operating conditions. These preliminary lab results suggest that use of a casting simulator could suffice as a means for characterizing primary cooling heat transfer in HDC casting, thus avoiding the need for extensive plant trials.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate
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9

Xue, Boran. "Heat transfer characterization of secondary cooling in the horizontal direct chill casting process for aluminum alloy re-melt ingot." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/26877.

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Horizontal direct chill (HDC) casting is a continuous process used to produce extrusion billet and re-melt aluminum ingot. As in vertical DC casting, secondary cooling, where water directly impinges on the cast surface, is an important process that can affect cast quality and production rates. During HDC casting, secondary cooling is further complicated by horizontal water flow and the water spray conditions. Characterizing the heat transfer during the secondary cooling process is necessary for improved understanding of the process. Since the accessibility of the HDC casting machine is limited and the direct measurement of heat transfer in secondary cooling are difficult, numerical modeling thus becomes a good approach for process development. In this research, the heat transfer occurring in secondary cooling of an HDC ingot has been studied. Water spray conditions on three different casting surface were simulated separately by quenching the blocks of HDC cast A356 aluminum alloy which was cut from a T-ingot. The temperature history during the cooling within the blocks was recorded by sub-surface thermocouples. An inverse heat transfer model was developed and used to calculate the heat fluxes on the casting surfaces using measured temperature data. The heat fluxes were characterized via boiling curves, which are the functions of surface temperatures, in each spray configuration. The effects of operational parameters, including the casting speed and the water cooling rate, were investigated by comparing the characteristic features of the calculated boiling curves. The spray configuration effect was also studied with the calculated results from the stationary tests in a qualitative fashion. Then a fitting technique was developed to idealize the calculated boiling curves. The idealized boiling curves were summarized into the functions, which provide practical database for application of the results in this research. All in all, the simulation apparatus and the IHC model provide the ability of characterizing the heat transfer occurring in secondary cooling region of HDC casting with lab-scale experiments. Consequently, the expensive and risky plant trials can be avoided.
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10

Nourgaliev, Robert R. "Modeling and analysis of heat and mass transfer processes during in-vessel melt progression stage of light water reactor (LWR) severe accidents /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs98/nour0427.pdf.

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Книги з теми "Melt transfer"

1

Polymer melt processing: Foundations in fluid mechanics and heat transfer. New York: Cambridge University Press, 2008.

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2

Blackman, Irving L. Transferring the privately-held business: Creating a succession plan to meet your changing tax, estate, and business needs. Chicago, Ill: Probus Pub. Co., 1993.

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3

Martin, Clive D. Meet the Land Court judicial forum, 2010. Boston, MA: MCLE, 2010.

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4

Land Court Judicial Forum (1994). Land Court Judicial Forum '94: Meet the judges of the Land Court. Boston, MA (10 Winter Pl., Boston 02108-4751): MCLE, 1993.

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5

HomeBase (San Francisco, Calif.). Homelessness in the Bay Area: Transform basic causes, meet human needs : a HomeBase report. 3rd ed. [San Francisco]: Center for Common Concerns, 1994.

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6

Albany Law School Conference on Intellectual Property (4th 1989 Saratoga Springs, N.Y.). The international playing field: How industry, government, and academia can meet the challenges in the development and commercialization of new technology to and from abroad. Edited by Stevenson Sandra M, Albany Law School, and Rensselaer Polytechnic Institute. New York, NY (11 Penn Plaza, New York 10001): M. Bender, 1990.

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7

United States. Congress. House. Committee on Science. Subcommittee on Space and Aeronautics. How space technology and data can help meet state and local needs: Field hearing before the Subcommittee on Space and Aeronautics, Committee on Science, House of Representatives, One Hundred Seventh Congress, second session, May 20, 2002. Washington: U.S. G.P.O., 2002.

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8

Transformational change: How to transform mass production thinking to meet the challenge of mass customization. Westerville, OH: Corporate Performance Systems, Inc., 1999.

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A bill to authorize certain tribes in the state of Montana to enter into a lease or other temporary conveyance of water rights to meet the water needs of the Dry Prairie Rural Water Association, Inc.: Report (to accompany S. 1219). [Washington, D.C: U.S. G.P.O., 2006.

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United States. Congress. Senate. Committee on Indian Affairs (1993- ). A bill to authorize certain tribes in the state of Montana to enter into a lease or other temporary conveyance of water rights to meet the water needs of the Dry Prairie Rural Water Association, Inc.: Report (to accompany S. 1219). [Washington, D.C: U.S. G.P.O., 2006.

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Частини книг з теми "Melt transfer"

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El Ganaoui, M., P. Bontoux, and D. Morvan. "Numerical Solutions of Moving Boundary Problem with Thermal Convection in the Melt and Magnetic Field During Directional Solidification." In Transfer Phenomena in Magnetohydrodynamic and Electroconducting Flows, 295–309. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4764-4_21.

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Scagliarini, Andrea, Enrico Calzavarini, Daniela Mansutti, and Federico Toschi. "Modelling Sea Ice and Melt Ponds Evolution: Sensitivity to Microscale Heat Transfer Mechanisms." In Mathematical Approach to Climate Change and its Impacts, 179–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38669-6_6.

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Kanai, Toshitaka. "Dynamics, Heat Transfer, and Structure Development in Tubular Film Extrusion of Plymer Melt." In Film Processing, 73–112. München: Carl Hanser Verlag GmbH & Co. KG, 1999. http://dx.doi.org/10.3139/9783446401792.005.

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Avdonin, N. A., and V. A. Smirnov. "Numerical Analysis of Heat and Mass Transfer in the Growth of Large Single Crystals from the Melt." In Growth of Crystals, 221–28. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-7119-3_22.

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Enger, Sven, Michael Breuer, and Biswajit Basu. "Numerical Simulation of Fluid Flow and Heat Transfer in an Industrial Czochralski Melt Using a Parallel-Vector Supercomputer." In High Performance Computing in Science and Engineering ’99, 253–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59686-5_22.

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Baldwin, Douglas. "Meat: Heat Transfer in Meat." In Handbook of Molecular Gastronomy, 419–22. First edition. | Boca Raton: CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429168703-62.

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Tran, Hong-Chuong, and Yu-Lung Lo. "A New Heat Transfer Simulation Model for Selective Laser Melting to Estimate the Geometry of Cross Section of Melt Pool." In Mechanics of Additive and Advanced Manufacturing, Volume 9, 13–16. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62834-9_3.

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Aslam, Mohd, and Chinmaya Kumar Sahoo. "Study of the Effect of Welding Current on Heat Transfer and Melt Pool Geometry on Mild Steel Specimen Through Finite Element Analysis." In Lecture Notes in Mechanical Engineering, 545–53. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7711-6_54.

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Stribeck, Norbert, Peter Bösecke, Rüdiger Bayer, and Armando Almendarez Camarillo. "Structure transfer between a polymer melt and the solid state. Investigation of the nanostructure evolution in oriented polyethylene by means of continuous X-ray scattering." In Scattering Methods and the Properties of Polymer Materials, 127–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b107331.

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Marks, Bradley P. "Heat and Mass Transfer." In Thermal Processing of Ready-to-Eat Meat Products, 3–15. Oxford, UK: Wiley-Blackwell, 2009. http://dx.doi.org/10.1002/9780813808611.ch1.

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Тези доповідей конференцій з теми "Melt transfer"

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Song, S. P., B. Q. Li, and K. G. Lynn. "An Integrated Model for Czochralski Melt Growth of Optical Crystals." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47403.

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This article presents the phenomena of melt flow, heat transfer, and solidification in Czochralski (CZ) melt growth processes of optical crystals, with emphasis on the effect of internal radiative heat transfer on the temperature distributions in oxide melt and crystal, melt convection, and melt-crystal interface shape. An integrated numerical model has been developed for simulating the physical phenomena in generic CZ furnaces, which includes the models for electromagnetic induction in crucible, surface exchange radiation in furnace, internal radiation in semi-transparent oxide melt and crystal, Marangoni convection in the melt, and solidification. Each developed model compares well with available analytical solutions. Numerical simulations were carried out for the prediction of fluid flow and heat transfer in furnaces. The simulation results show that the variation in optical properties of melt and crystal strongly impact their temperature distributions. It also affects the melt flow profile and intensity. The interface shape becomes more deeply convex toward the melt, as the optical thickness of the melt increases. However, the optical thickness of the crystal exhibits a minor impact on the interface shape. The results also show that the natural convection is dominated in the melt and the Marangoni flow enforces the natural convection.
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Journeau, Christophe, Claude Jegou, and Gerard Cognet. "INFRARED THERMOGRAPHY FOR MEASURING THE SURFACE TEMPERATURE OF AN OXIDIC MELT." In Radiative Transfer I. Proceedings of the First International Symposium on Radiation Transfer. Connecticut: Begellhouse, 1995. http://dx.doi.org/10.1615/ichmt.1995.radtransfproc.440.

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Munakata, Tetsuo, Satoshi Someya, and Ichiro Tanasawa. "Effect of high frequency magnetic field on FZ silicon melt convection." In International Heat Transfer Conference 12. Connecticut: Begellhouse, 2002. http://dx.doi.org/10.1615/ihtc12.2050.

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Hawkes, Grant, John Richardson, Dirk Gombert, and John Morrison. "Heat Transfer Model for an RF Cold Crucible Induction Heated Melter." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47397.

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A method to reduce radioactive waste volume that includes melting glass in a cold crucible radio frequency induction heated melter has been investigated numerically. The purpose of the study is to correlate the numerical investigation with an experimental apparatus that melts glass in the above mentioned melter. A model has been created that couples the magnetic vector potential (real and imaginary) to a transient startup of the melting process. This magnetic field is coupled to the mass, momentum, and energy equations that vary with time and position as the melt grows. The coupling occurs with the electrical conductivity of the glass as it rises above the melt temperature of the glass and heat is generated. Natural convection within the molten glass helps determine the shape of the melt as it progresses in time. An electromagnetic force is also implemented that is dependent on the electrical properties and frequency of the coil. This study shows the progression of the melt shape with time along with temperatures, power input, velocites, and magnetic vector potential. A power controller is implemented that controls the primary coil current so that the power induced in the melt does not exceed 60 kW. The coupling with the 60 kW generator occurs with the impedance of the melt as it progresses and changes with time. With a current source of 70 Amps (rms) in the primary coil and a frequency of 2.6 MHz, the time to melt the glass takes 0.8 hours for a crucible that is 10 inches in diameter and 10 inches high.
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Lin, Bochuan, Shen Zhu, Heng Ban, Chao Li, Rosalia N. Scripa, Ching-Hua Su, and Sandor L. Lehoczky. "Thermal Property Measurement of Semiconductor Melt Using Modified Laser Flash Method." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47448.

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This study further develops the standard laser flash method for the measurement of multiple thermal properties of semiconductor melts. The standard laser flash method is widely used to measure thermal diffusivity of solids. Our modified procedure allows thermal diffusivity, thermal conductivity, and specific heat capacity of molten semiconductor material to be determined simultaneously. The transient heat transfer process in the melt and its quartz container was computationally studied in detail. A fitting procedure based on the numerical result and the least root-mean-square error fitting to the experimental data was used to extract thermal diffusivity, specific heat capacity, and thermal conductivity. The results for tellurium (Te) at 873 K: specific heat capacity 300.2 J/kg K, thermal conductivity 3.50 W/m K, thermal diffusivity 2.04×10−6 m2/s, are in good agreement with data published in the literature. Furthermore, uncertainty analysis showed quantitatively the effect of sample geometry, transient temperature measured, and the energy of the laser pulse on the results.
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Golliher, Eric, Andy Hong, Greg Pace, Barbara Sakowski, Dan Gotti, and Jay Owens. "Evaporative Heat Transfer Mechanisms within a Heat Melt Compactor." In 43rd International Conference on Environmental Systems. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-3392.

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Tanasawa, Ichiro, and Tetsuo Munakata. "STUDY OF SILICON MELT CONVECTION DURING THE RF-FZ SINGLE CRYSTAL GROWTH PROCESS." In International Heat Transfer Conference 11. Connecticut: Begellhouse, 1998. http://dx.doi.org/10.1615/ihtc11.1120.

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Zhou, J., H. L. Tsai, P. C. Wang, and R. Menassa. "Melt Flow and Porosity Formation in Pulsed Laser Keyhole Welding." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56732.

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Instead of CW (continuous wave) mode, pulsed mode laser welding has been popularly used in industry especially for Nd: YAG lasers. In pulsed mode laser keyhole welding, pores have been frequently observed near the root of the solidified weld. Our previous studies have indicated that the formation of porosity is caused by two competing mechanisms during the keyhole collapse process, and they are 1) the speed of solidification process for the melt surrounding the keyhole and 2) the speed of melt backfilling the keyhole. If the solidification process is too fast and completed before the keyhole is filled, pores will be formed. A technique to control the laser power trailing when it is turned off during the keyhole collapse process has been proposed and experimentally validated to postpone the solidification speed and, as a result, to prevent the porosity formation. However, this method fails for a “deep” keyhole. In this study, an electromagnetic force is used to control the melt backfill flow which is proved to be very effective in preventing porosity from occurring. A mathematical model has been developed to calculate the transient heat transfer and fluid flow during the keyhole formation and collapse processes in pulsed laser welding. The continuum model is used to handle the entire domain including solid phase, liquid phase and mush zone. The enthalpy method is employed to handle the absorption and release of latent heat during melting and solidification. The laser induced plasma inside the keyhole due to the Inverse Bremsstrahlung (IB) absorption is considered and the temperature distribution inside the keyhole is calculated. Both the Fresnel absorption and multiple reflections of laser beam energy at the keyhole walls are also considered. Parametric studies to determine the desired strength of the electromagnetic force and its duration under several laser welding conditions have been conducted. Computer animations showing the keyhole formation and collapse, metal flow, and possible formation of pores will be presented.
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Wei, C., and T. Zien. "Integral calculations of melt-layer heat transfer in aerodynamic ablation." In 38th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-205.

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Zhang, Huaichen, Silvia V. Nedea, Camilo C. M. Rindt, Herbert A. Zondag, and David M. J. Smeulders. "Prediction of Anisotropic Crystal-Melt Interfacial Free Energy of Sugar Alcohols Through Molecular Simulations." In The 15th International Heat Transfer Conference. Connecticut: Begellhouse, 2014. http://dx.doi.org/10.1615/ihtc15.tdy.008636.

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Звіти організацій з теми "Melt transfer"

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Witt, August F. LEC Growth of InP with Magnetic Field Assisted Melt Stabilization and Heat Transfer Control. Fort Belvoir, VA: Defense Technical Information Center, February 1988. http://dx.doi.org/10.21236/ada196748.

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McHugh, P. R., and J. D. Ramshaw. A computational model for viscous fluid flow, heat transfer, and melting in in situ vitrification melt pools. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/10140275.

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McHugh, P. R., and J. D. Ramshaw. A computational model for viscous fluid flow, heat transfer, and melting in in situ vitrification melt pools. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/5504904.

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Adelberg, Jeff, Halina Skorupska, Bill Rhodes, Yigal Cohen, and Rafael Perl-Treves. Interploid Hybridization of Cucumis melo and C. metuliferus. United States Department of Agriculture, December 1999. http://dx.doi.org/10.32747/1999.7580673.bard.

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The long-term motivation for this research is to transfer useful traits from a broad based gene pool of wild species into the narrow base of a cultivated crop in Cucumis. Our primary focus was to use polyploid prior to fertilization as a tool to overcome fertility barriers in the cross between C. melo and C. metuliferus. In conducting this research, we explored all combinations of tetraploid and diploid parents, in reciprocal combinations. Pollinations were made in both the field and greenhouse, using emasculated flowers, moneocious females, and open pollination by insect vectors, with morphological selection criteria. After observations of thousands of ovaries, we still have no definitive proof that this hybridization yielded viable embryos. The most promising results came from using tetraploid C. metuliferus, as the maternal parent in the interspecific hybridization, that set fruit were seeds contained small embryos that did not germinate. To obtain fruit set, it was important to rear plants in a cooler sunny greenhouse, as would be found in late winter/early spring. A second interspecific hybrid between wild and cultivated Cucumis, C. hystrix x C. sativus, yielded fertile progeny for the first time, while concomitantly working toward our primary goal. Two distinct treatments were necessary; 1) special plant husbandry was necessary to have the wild species produce fruit in cultivation, and 2) embryo rescue followed by chromosome doubling in vitro was required for fertility restoration. Backcrosses to crop species and resistance to nematodes are compelling areas for further work.
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van Houwelingen, K. M., and T. J. A. Gies. Bemestingsproef digestaat op veen : Het vaststellen van de N-werking van onvergiste en vergiste mest en varianten van de vergiste mest via een veldproef op veengrond bij Kennis Transfer Centrum (KTC) te Zegveld. Wageningen: Wageningen Environmental Research, 2017. http://dx.doi.org/10.18174/413576.

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Hutchinson, M. L., J. E. L. Corry, and R. H. Madden. A review of the impact of food processing on antimicrobial-resistant bacteria in secondary processed meats and meat products. Food Standards Agency, October 2020. http://dx.doi.org/10.46756/sci.fsa.bxn990.

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For meat and meat products, secondary processes are those that relate to the downstream of the primary chilling of carcasses. Secondary processes include maturation chilling, deboning, portioning, mincing and other operations such as thermal processing (cooking) that create fresh meat, meat preparations and ready-to-eat meat products. This review systematically identified and summarised information relating to antimicrobial resistance (AMR) during the manufacture of secondary processed meatand meat products (SPMMP). Systematic searching of eight literature databases was undertaken and the resultantpapers were appraised for relevance to AMR and SPMMP. Consideration was made that the appraisal scores, undertaken by different reviewers, were consistent. Appraisal reduced the 11,000 initially identified documents to 74, which indicated that literature relating to AMR and SPMMP was not plentiful. A wide range of laboratory methods and breakpoint values (i.e. the concentration of antimicrobial used to assess sensitivity, tolerance or resistance) were used for the isolation of AMR bacteria.The identified papers provided evidence that AMR bacteria could be routinely isolated from SPMMP. There was no evidence that either confirmed or refuted that genetic materials capable of increasing AMR in non-AMR bacteria were present unprotected (i.e. outside of a cell or a capsid) in SPMMP. Statistical analyses were not straightforward because different authors used different laboratory methodologies.However, analyses using antibiotic organised into broadly-related groups indicated that Enterobacteriaceaeresistant to third generation cephalosporins might be an area of upcoming concern in SPMMP. The effective treatment of patients infected with Enterobacteriaceaeresistant to cephalosporins are a known clinical issue. No AMR associations with geography were observed and most of the publications identified tended to be from Europe and the far east.AMR Listeria monocytogenes and lactic acid bacteria could be tolerant to cleaning and disinfection in secondary processing environments. The basis of the tolerance could be genetic (e.g. efflux pumps) or environmental (e.g. biofilm growth). Persistent, plant resident, AMR L. monocytogenes were shown by one study to be the source of final product contamination. 4 AMR genes can be present in bacterial cultures used for the manufacture of fermented SPMMP. Furthermore, there was broad evidence that AMR loci could be transferred during meat fermentation, with refrigeration temperatures curtailing transfer rates. Given the potential for AMR transfer, it may be prudent to advise food business operators (FBOs) to use fermentation starter cultures that are AMR-free or not contained within easily mobilisable genetic elements. Thermal processing was seen to be the only secondary processing stage that served as a critical control point for numbers of AMR bacteria. There were significant linkages between some AMR genes in Salmonella. Quaternary ammonium compound (QAC) resistance genes were associated with copper, tetracycline and sulphonamide resistance by virtue of co-location on the same plasmid. No evidence was found that either supported or refuted that there was any association between AMR genes and genes that encoded an altered stress response or enhanced the survival of AMR bacteria exposed to harmful environmental conditions.
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Yoozbashizadeh, Mahdi, and Forouzan Golshani. Robotic Parking Technology for Congestion Mitigation and Air Quality Control Around Park & Rides. Mineta Transportation Institute, June 2021. http://dx.doi.org/10.31979/mti.2021.1936.

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A lack or limited availability for parking may have multiple consequences, not the least of which is driver frustration, congestion, and air pollution. However, there is a greater problem that is not widely recognized by the public, namely the negative effect on the use of transit systems due to insufficient parking spaces close to key transit stations. Automated parking management systems, which have been successfully deployed in several European and Japanese cities, can manage parking needs at transit stations more effectively than other alternatives. Numerous studies have confirmed that quick and convenient automobile access to park-and-ride lots can be essential to making public transit competitive with the automobile in suburban areas. Automated parking systems use a robotic platform that carries each vehicle to one of the locations in a custom designed structure. Each location is designed compactly so that considerably more vehicles can be parked in the automated garages than the traditional parking lots. Central to the design of these systems are three key technologies, namely: 1. Mechanical design and the operation of vehicle transfer, i.e., the robotic platform 2. Structural and architectural requirements to meet safety and earthquake standards, among other design imperatives, 3. Automation and intelligent control issues as related to the overall operation and system engineering. This article concerns the first technology, and more specifically the design of the robotic platform for vehicle transfers. We will outline the overall design of the robot and the shuttle, followed by a description of the prototype that was developed in our laboratories. Subsequently, performance related issues and scalability of the current design will be analyzed.
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Gachot, Sebastien, Carmine Paolo De Salvo, and Gonzalo Rondinone. Analysis of Agricultural Policies in Guyana (2015-2019). Inter-American Development Bank, August 2022. http://dx.doi.org/10.18235/0004408.

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The agricultural sector plays a crucial role in Guyanas economic development by contributing 21.15% of gross domestic product (GDP). However, the share of the agricultural sector has been gradually decreasing over the years. This monograph offers an update of the OCDEs Producer Support Estimate (PSE) methodology applied to Guyana for 2015-2019. The PSE approach focuses on two main elements of support: (i) the effect of government policy on prices received by agricultural producers, and (ii) the support provided through budgetary transfers to the sector. The market price support (MPS) remained Guyanas main PSE component. Expressed as a share of the total PSE, Guyanas MPS averaged 59% between 2015 and 2018. Following the end of Government transfers to GuySuCo in 2019, which led to a sharp decline in budget transfers to the agricultural sector, it rose to 96%. The main driver of Guyanas MPS remained the import duties in place to protect domestic producers of poultry meat. This report also documents the evolution of agricultural policies-related greenhouse gas emissions in Guyana for the first time. The poultry subsector, which receives most of the policy support in Guyana, emits little. Sugar and rice, on the other hand, are the commodities with the highest GHG emissions per hectare. To conclude, several policy recommendations are presented.
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Wang, Y. Y., B. M. Biwer, and C. Yu. A compilation of radionuclide transfer factors for the plant, meat, milk, and aquatic food pathways and the suggested default values for the RESRAD code. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/10187110.

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Henry, Samuel L. How the 36th Infantry Division will Transform to Meet the Nation's Strategic Posture as Defined in the Army's Campaign Plan by 2008. Fort Belvoir, VA: Defense Technical Information Center, March 2005. http://dx.doi.org/10.21236/ada432500.

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